FINALLY got a JSX. It's an '04, in near mint condition, with original EH EL34's in it. The thing sounds DAMN good. Only reiterates why I wanted one so bad, I LOVE IT!

However, one can only wonder what a power tube upgrade would do for it. The last one I had, I went JJ EL34's in it. Can't help but wonder what 6L6's would sound like? I like the EL34 growl, for sure, but who knows? I liked the aggressive 6L6's in the 6505+, as well. But, the JSX smokes it!

i had one at one time, and went from the factory el34's to 6l6's and it totally changed the tone in my opinion .... the sound got a lot beefier, and the low end response was insane. the cleans on the amp seemed to get a bit darker than they were with the el34's but i actually found out i liked it better that way anyways .... for the cost of tubes i would try the 6l6's out ... you can always go back if you dont like em

in da JSX, bring in the jj KT77 !! you get the mid grind from El34 and awesome, beefier low-end. and more range in the higher spectrum too.

Yeah, been pondering that..Do they run in EL34, or 6L6 mode?

if I remember correctly, EL34 switch. Btw the bias reading in the back are supposed to be wrong, you have to go inside. I never did that myself, I trusted my ear and the multimeter reading with the pins.

if I remember correctly, EL34 switch. Btw the bias reading in the back are supposed to be wrong, you have to go inside. I never did that myself, I trusted my ear and the multimeter reading with the pins.

If you are searching for a sound anything like Overkill they used solid state Carvin power amps live and in the studio..

Yeah, depending on what era. I believe the 2 guitar players they had from Horrorscope to WFO (Gant/Cannavino), used Carvin Power amps, and ADA MP-1's...I think, even Linsk used the ADA's at one time, as well as Marshalls. I'm pretty sure he went to 5150/6505's..

I've got their tone, and then some on the JSX's crunch channel. I'm really after *my* tone, not anyone else's...Well, I'd settle for J. Schaffer's tone, on "Something Wicked"...

I have tried just about everything in mine includings kt77's and to me the SED 6l6gc's (winged C's) are by far the best. Much fuller and warmer on the clean channel, smoother and chunkier on the two lead channels. My favorite sound is a tube screamer boosting the crunch channel on this amp. My only thing I would say though is the Gflex cab is the only one I really love this head with (thankfully that is what I have) I think with V30's it makes it way too honky in the midrange and kind of harsh. Good luck I still really dig mine after a few years of use and it's never failed me.

I have tried just about everything in mine includings kt77's and to me the SED 6l6gc's (winged C's) are by far the best. Much fuller and warmer on the clean channel, smoother and chunkier on the two lead channels. My favorite sound is a tube screamer boosting the crunch channel on this amp. My only thing I would say though is the Gflex cab is the only one I really love this head with (thankfully that is what I have) I think with V30's it makes it way too honky in the midrange and kind of harsh. Good luck I still really dig mine after a few years of use and it's never failed me.

I have a G-Flex 2x12 myself. I know SED's are top notch, I'm trying not to spend that kind of money..They're nearly $120 a quad..

I also ran my 'bias knob' 3/4 towards the hotter side...I liked having the hotter power section even though, peavey's tend to stay pretty clean anyway...it just made the amp a little more forgiving. I tried putting the el34's back in at some point...and returning the bias knob...and didnt care for it.

I have tried just about everything in mine includings kt77's and to me the SED 6l6gc's (winged C's) are by far the best. Much fuller and warmer on the clean channel, smoother and chunkier on the two lead channels. My favorite sound is a tube screamer boosting the crunch channel on this amp. My only thing I would say though is the Gflex cab is the only one I really love this head with (thankfully that is what I have) I think with V30's it makes it way too honky in the midrange and kind of harsh. Good luck I still really dig mine after a few years of use and it's never failed me.

I have a G-Flex 2x12 myself. I know SED's are top notch, I'm trying not to spend that kind of money..They're nearly $120 a quad..

i really liked the ruby 6l6gcmstr's in it as well and they are half the price of the SED's. Really only about a 5% difference in the two.

I prefer the grind and punch of EL34's in my JSX.Another thing I like is put a tame sounding 12AX7 in the V3 spot which is for the acive eq. It helps smooth the eq out a bit and makes the mids and highs more pleasant.

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